Area and Circumference of Circles Review

Find the area of the circle below.

• 100 cm²

• 225 cm²

• 9 cm²

• 28.26 cm²

Find the circumference (to the nearest whole number)

• 88 in

• 44 in

• 116 square in

• None of the above

What is the distance around a circle?

• Circumference

• Area

• Diameter

• Radius

What is the area of a circle with a diameter of 12cm?

• 452.39cm²

• 139.12cm²

• 113.1cm²

• 84.23cm²

Match the formulas to the measurements indicated.

• d/2

• To find the area of a circle use:

• To find the circumference of a circle use:

• 2r

• To find the radius of the circle use:

• To find the diameter of a circle use:

A circular mirror has a 2 inch frame around it. The mirror itself is 8 inches in diameter. What is the area of the frame? Use 3.14 for pi.

Identify the parts of the circle and show how you would find the area and circumference.

Groups:

(a) radius

,

(b) diameter

,

(c) circumference

,

(d) area

Find the area of a circle with a diameter of 12 cm.

• 36π cm²

• 113.04 cm²

• 144π cm²

• 452.16 cm²